> Testing is hard when the code it tests is OOP, has mutations everywhere, and has big functions that do too many things. Yes, that means the software being te

> Testing is hard when the code it tests is OOP, has mutations everywhere, and has big functions that do too many things. Yes, that means the software being tested is not very testable. And should probably be refactored. https://en.wikipedia.org/wiki/Testability https://en.wikipedia.org/wiki/Testability